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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '879b739b3fdced8f8cbab975d6c9b37ba9cd1f6177adbd908c160ea0adf124bd' 
  AND token = 'vsf+8ha1M1hfau18qaoMqDL6mfXRk+sOwd7oR+6OU/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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