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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06764aae3032d5bffdcab01d06cbb3d9c058be0fb1596ec571d67469d9575da7' 
  AND token = '8sE5dfCwsxyQhWnTOsJQMRB+mJBfXuq6cLhDQxtdYhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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