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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4a2712880796522bc348c37f4e566884e066024af23a23f75183b96e5a346ea' 
  AND token = '7IxB4YlkkKzkoHZ4Tj7te+/hR1p8Yj3XhFWXDX48RBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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