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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bac9c612237ead937e0d29009fe6e24efd18d9a2fd69b88cfba958df12ff05c' 
  AND token = 'NLstVpcvLXUJpX8sLmMu3TNbUQ1ZvSSOE3l8BRVFKxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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