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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1bc68eb367ae7acff6e678e85184d71374d4fb03d1a9614a27e68e1fc56536a' 
  AND token = 'MknFlgQPCeCEXaR6lnJhqMgIvQQQrOoBU/S6p7id8xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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