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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6bfb25591ebc758a60160af787ac85c7a05b87f6f6f878bf78b097815e0b6f8' 
  AND token = 'YDsf9ZKaM0j40uCKptABzRsePi/zPhK6g0kY0TGo6AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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