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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab7d639023d0b31d142b4833e3c9643e05471186c6aba8675d5306a3619692f' 
  AND token = 'NpVd1r7hZyvauIBfURCN22zmIrcgxj3GkWHMMMGrmm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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