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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f5aa1b075874d8602935505d44caa765ac1dfb612a127d363e7146f1962c39' 
  AND token = 'lD+Ywe+3la0fODel4xTlJBLY5H02FHfjnhyKi2bjDAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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