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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9945f55f03cfeddf65267907f2af87c6af9268613e103ae0319d9c86cce2139f' 
  AND token = '3sbi6v1CMJA0VBlmpxWRjjUNAkh9Hg76ogmq+k+cjN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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