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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292f204b317466f8c14ac6086be48f5bce531fa64e675001797ae313e8bb7cf7' 
  AND token = 'igd5E6viQzXttUdEv3f8CzLai8OGy1UfLpzusSZi+5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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