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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9bc3f02533f4f510e48146b300986d50987c9dd4ad466f845a3845e0ada13a5' 
  AND token = 'YNdflPlaoXSt0rUpDioeDvsrMZqhMLD9t2XK0LqU1HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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