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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7b98c24d0a018c3fbeb65564462ea5ae456a08bbb510d25c7ccf9fcd57dce4' 
  AND token = '1hQHvdC855lgC5D5gDm0BdAfAv34mjPzCC1Y9+RXxPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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