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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5a76f6fa5c998b30b16c68c489553b5e67a141457d6c5d5fbc8500c8b02c393' 
  AND token = 'cXlaAes5QTOc8juvbp5uvVFUlpuIpOnG+92vjaKF4p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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