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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fffb5c8de6b43ba9f194de67356016ca89d26ce77f906fcde7e440a4065d9bd4' 
  AND token = 'QksNEvhUyu5lYnEhG/niD28U6nEG80HDTzaOAqr9oJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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