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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a077462fc9f84cc02e5c4012bd20921462142d7ce20dac7e5fd21577bc73d6c' 
  AND token = 'QQVuIjlGbc9mv5LKYT3ZrF1v/6uDeOP8oQjWyCKXcq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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