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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085a969d6597110df242e2210b4cb63c9f0f715f099e221f094e5cd08d15a196' 
  AND token = '7ZaFShlZT7hc99JKFWcylX+hGKvC1b3RdqlR2+ZkC90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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