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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6948521aaf924ce7143833fa607c0dc500aaa6c1be1cfbeb3b79387c5c7472a' 
  AND token = 'OGABW4DrYmz7sil3PDpY9LOUbJty3OCpr2RFwhADaAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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