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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccd084ba266b3769d250a56f6d1e9f5e112c79087bbb16b91c54490631df768' 
  AND token = 'yqplIgTs2czBGOW7n2q0MonlrmGNzTEkBYex70Otpc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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