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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85f899c137f5ea424915d0193c504c0c3a063fa3fe9de80d9fa26dbf4eecd5ee' 
  AND token = '5ueXXJpo3CIOC1GT4bsXphyy9pTfWW+vZiDoZ/7r+bM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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