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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccee4ccdfc7ae0e00a1ab32f1ea5ef7e76790c9adda94fd167dcfa8e549bc7ed' 
  AND token = 'AybTC/qUVo/lxpMQx9+bXku3yb/wxtDDN4QpfmW1990=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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