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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88b8acb05fcf1f553ab7ff86ab87d3f8b4b7ecc02dae864a37f9cddd4c09b837' 
  AND token = 'K7ZCOL24MJv5Mlp2RiqFygrmvDZPiqmRI1jeQcX57FQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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