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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '353bdf6e75f275da8c0a81acb974ea577a81038fb69487a5cbca9fae480ec1f7' 
  AND token = 'B7VuRX781CTH42jCpx6Oj1fuBGRNlbITpGOkdulFKtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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