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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3371dbdd73f58bb3d6207014df15178fa8976ef720fc90c60b617d345f978c0b' 
  AND token = 'xqfCf55/EqHc6yF0d48+EY/olKRhnJTDBC4+vPOvFdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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