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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c915e8a43806192f0622697243b36ba25e89c7ae9d0030c9ebd374d7d56a6e' 
  AND token = 'DUTG/5PdZcUeK7DmnG2bo759sfaQtL4K6CR1g6McyV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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