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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1aca452f3abb8a9bb475e1cbb14b3e55f0ab89a9e97a245f50ae0ce91c7fd93' 
  AND token = 'jAl1TxWYNlR3cncqs5Y+mXDFo9Amhgxl4Yejzfsuadc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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