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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c7c041dcfab07597d03c1251394d7562015ceee072ebbb8e65bec1cf90d31a1' 
  AND token = 'uufy2e6rBgf4RM9ffGUPza/nWXPXPxZZXp+0cgwoxog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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