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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd28ade5904af1d020a99c833847ad6fdb6d0373f84bdd68cee666487dfa05c8' 
  AND token = '0afTm9yOgR1B7t/6u+nJPb59DyfoV7qIE1fEYCDnUFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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