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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4af860ac9a95fa1e0a15a049266241777d7f7f2fbc0c79cb294da822f00d605' 
  AND token = 'nua+d2A8ZbuV0O2FA63y7fzQ7Yog5axytcEE5qURweM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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