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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23c8c9aacb6c51941b3314be83b157c765fa59c4103e0264e5bcd7889a8414ab' 
  AND token = 'jGRr7US9BXWXrwy+nOdTK8tLpIQZ1pocjQdH6DKXmHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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