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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '228f56ad2c80b0131efafa6dd3f666c8887f14a326641b40e83835bb1502516a' 
  AND token = 'PDZnIY3Ys8srQKjkCXvHmV4HS6uVOY2O2uQULYRi+Ng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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