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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df8b5fcc742f46d69430c1ca674126576e71225086e9f1b41ffa6858fb6dd35' 
  AND token = 'hKZKDvjsWIKSsYetq8aGFrf8tf3b6WGI/RPDycmUGqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00117

JSON explain

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