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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc572c35a405f2de849cc3ec6e81d39d5671e8ceeaf8206f22d78636c9532f87' 
  AND token = 'KvaKaKdxaAbeIqL64ik0jH2uNoa0UOY4kdEysyHaDhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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