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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c64d601ae9dfdf884fd152cd0999042633327e0589ec731ee52e86df50c882' 
  AND token = '6oxSd6WG39m6rV6qWqluu7ClTQr6EDov3GGd2u0WFHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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