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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183d752b99572ae69c233b14b5f03fbc4825d2125c9886cf3fcb2214aeaa0558' 
  AND token = 'EWqAGULtscyoZI6npF7kGCcP3qlk9KlacJKOjBCeRDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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