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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79694a55e89fa268c7a511355c66961f4fd74e66430a142c80b8221fc8d068e0' 
  AND token = 'bMfQfPqoWDV4vleB+vlIPbl3kaeK0+cOkglVrH48uig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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