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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4acf1935c8b2cb039777d6141891a0288e6bddfd653b0d0afcd6d67aee3355dc' 
  AND token = 'psPrGEfkDlWpLuQQKGVsjpcN/YtUY8lG6BmChc3WQ9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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