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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19464d5d898d485a6ab97743b57f450e8cc6d5b85414cf4033a5bbbde1625b2b' 
  AND token = 'L0+yoYSjUZselSGk3NPqhDY9C5slyljHMKt6PXDROzY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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