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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dccf9b01e45201b711be5fb0bffd303d18e5f75c1248599df243ccdf5b9b19ad' 
  AND token = 'X9CIe2kol+y7m/SStr2p6Cna35wu7PQjUhwelnzhASQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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