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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a36ed83833f8c81b7d1c6a7480aee8f27765203ba2c043b4e7a3cd72d136511' 
  AND token = 'MS0ZHAY6Ft/BG5V/7Bzk79+PCWFx26VxosLC+LewraQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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