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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116fd9d2d7cd658149f279b3e4bc7efb5cbafb97b22077a71fe53ece6ab7d244' 
  AND token = 'BsDaGph8M6hPIS8BdfhxM1alT8Xt9dvSHlMprUutbQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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