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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b73ac6e5361a95dc264160fed46099d9972251c1c7601a56309bf0ac6e00e92' 
  AND token = 'eXtAf8XEcSyEp2carZDHG8tJ8HMFMK6BqZo+o8f6FGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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