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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbc5a41c46b9a4fab9bcd75fdb98779aba04fb9a1298e327cf7908b568c6e8d' 
  AND token = '2cmvgyGZhFOn5T7sYcsTKApqosfE34ziTubaGjF2As8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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