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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12fbf89d696885f44e2c17d41d519887348f066c40639459e1f3d0d8ab76dd14' 
  AND token = 'N8E36YVrwJD0lpnJJH7DZdPp2Kxi2/NZZUezoxcYPeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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