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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73d2caa8348551bb7b17d9719621ae1976734be3b9eadc3db07dd12bc8798c11' 
  AND token = 'UpyKJyQ0MLOenl4XLlYhcV6JMUyg4UHTKYWyrdSBt7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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