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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6490a8b2a07c6a4b2636877515d27e5bcc6693eef79db998e10fa19af433da' 
  AND token = 'J/1ds7xZTo1ap91LqMRMxklwL0PkbIT51vFw5zU8CY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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