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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad71c5bb27d1d843ca5a068d0d2ee48798c965bb9a3124fe8be4e429b22e3202' 
  AND token = 'FC7RKlWyWp4DNYyUbXFZwDlF9RYocLUh6wf5hViOQIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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