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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd45b4a2f86ea79e6f4aac47bd100f121a4f3deb3a304c030131245f3c8de725b' 
  AND token = '1H/FqwlQCQUYP9TtbiNKluQteymOgAO+pTFwobDjS6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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