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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0bc8aceeb852070bccc1e357d37aad61eac9f48ae3b914a26a49233a6f437f8' 
  AND token = 'qvo8PH6ldd52u4ICgaBKIaQ9p6DcklW3qlSe4nreOgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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