SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57649fa5b4173a91ce0bd63623f737f834bff8fcdd8a3247e9234b9e1d6fe11b' 
  AND token = 'kfuBaj/Y3T/Mt6kP+jqP3YqsJK4vS27g2mhiZ6xIDtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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