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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7666a6d20e05728d28918f8630e78b85681febbfed142a8a9479101b2a828f' 
  AND token = 'abHu3OqdvJ+N3+mlJN94P9NNIkzpCOci1sKyNJlbv5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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