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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b59aae34d7d5acdc73fd38600f6acc4a4198c58a3e0c237e9f5e208c1f25db1b' 
  AND token = 'wIflAaOB65Gt8husRuQhHo0w9cgXYxPRGFnLit3PcV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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