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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3efd7d4e30ef2de8676e9b28942db41c0bf3408b6026ccefa253a8885892cb' 
  AND token = 'uqrzrWG5q+4fyAMXumZoHbbWo1y2BLTFG4dJdwzFZtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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