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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a96bce613897eeee0c26a4b7ca35b51ba1bfb123ae6f96c38a568ea63f93de' 
  AND token = 'ySeC8j/rLIb53O37hHj2PRmmszUFnD+JweDg7JmB+5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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