SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfbc756171a9d434246d9bd61b7f924fd069ba732d3f162a7de356544dc22982' 
  AND token = 'CPbYVypnj2IXBA/8HHLlDza/VuxFoG2PqB4vL4w0L6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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