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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8606e10b2e9866fff24a3fc346d1ebc5413ed0fdb80a0c122f7d252320a9bda' 
  AND token = 'ZuRj6ZuLwQDqkgqYp7Enr5/joLemHyea57Lzx/nSZxk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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