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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2be222f940bb8517006a0bed4f9ed5c941c53c1db20d356e7e2bf80cbc0af18' 
  AND token = 'eTE80j8hJpJHZEoyRyEEqAVG0UTBjsUNlll8X87r5FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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