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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938d666888452351dade20d8080a325f45cc754872a63586f832b32ea4bb3b60' 
  AND token = '6gjJelKA7TBakaikDMx14aSQYA1wUDpUwzEmIMar5/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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