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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d8258f2bd113d2be54ad930246d9c54fd9832d21c21d78906cbe8771ae7e3f9' 
  AND token = 'dsxkZdS5mSC0L/n2HNQAfBHm/Z5wkPUhxaDI0ffGtcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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