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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dde735d00fe3d6453a2e7e397385e77944383ab4037503c7bd965b884139b1e' 
  AND token = 'EjnNRcZHEukG1ZCX1BUQ5XtVEO6lDT9gyBY7jeC1Qo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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