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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9a01f45f6876517544f82ef49d9173d9c61c6602461d47d4e6e6c2d3b9a17bc' 
  AND token = 'fZDElM8K/u5AqvIhlbHFoZ0RgCEkMhhlI7T5HU65lxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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