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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b7e3d3b3fec4cab68a2b934d8b0c4cb1e9e17364b2ac68a6a4e95f62540b965' 
  AND token = 'rrfTHfMjU2Hn0AzHXwbgbhnQPPzIHeIqeaGmIIpMVV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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