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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb120d0a0252e9482a37f581046014e2e8ea885022ad05b1065208fc6f349fba' 
  AND token = '1eFEpkGVcsgOm/4onRZxV2tS8mjMFm/JHs7AO3HJJ7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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