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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37d2f7f348f4c156f4105ec94a27918d796fd117f9e02345c610d4d02069837' 
  AND token = 'bm9KCo0JVsVgoyDmKLMsC95a2tr+g40ASHP4bfjd2r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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