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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c1ae06194e6b43f1a5613cca07ffd20823eaf4c6bd5edfeebc20efb1a775f8' 
  AND token = 'Ut98g3zlDTK30Z8mObS65727LkFxH4nc7ml3IuGiPyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}