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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bf388f4a845494dab1ba3ba438eae1524a4c135d4888e2fa39244192922a4c' 
  AND token = '/tcWSn24QRgNJmWm4UNfi8eLDKxPz+XwOCFjpR3q7M8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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