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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2157be96e4ee0a0e82267b7f86ca8a14e64f80a8ba987839b8ab91f6a281db03' 
  AND token = 'lR7TlWt3nGdlM7LHSeEkihNp1d86AC2JqYyEdO7cI6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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