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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '690b0e49c9910a1bfe51c8086ef56dbbc6ab42cb54ac96bf0cf3a8d23a686069' 
  AND token = 'JwbSolgVEUIoZ+yWfP4hhv5j4vKyXekl4IHG11u5xIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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