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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f722da832d69c7354ae39b35d809a2e73d974ab21d7769405bb08ba5ccf9b8' 
  AND token = 'uFkWyVuohf7m5qtB1d8oFe7Y1dtLd5iGAQcoPWtiXus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00076

JSON explain

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