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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db4ef4c3ec9501b2245bdb11e8315c80196724711e8b7a952967999d184571fc' 
  AND token = 'M7P1scuP7jwCwNLHOeiG3fDNfZ2TZKpW7NisQ1xY+cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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