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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea897c8d0b81a30b2bbccd4975d66f1fa79f092833f8c456af8091c30cfa74ac' 
  AND token = 'qQy5Gd8NT3AW2nkp1mITOK97tiSywdeH603n5NPnUN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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