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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dc4d36bbde79a583ed9833a2348f6c721e61c7a7166a27b90fa529ccaf085d7' 
  AND token = 'OAN2dvzNFLLpLbqAEKn2jSeioebNvTb1xZU+5zbgHpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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