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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f3e8ff4ae8c5f49e583091eb6d11b95c01a07116d0eba0f17d459ba8241f83f' 
  AND token = 'AeA8mmP8jB39vD4ahIxT1IEYj9OxJVRDh1qE2Aqe9dQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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